Okay, well I showed up bright and early this morning to turn in the exam. The dean had a voicemail from my professor, and she agreed to accept the exam. Later they agreed to not bar my exam from submission, but they did decide that they would dock my grade on the exam by 2/3 of a letter grade. That is better than I deserved but worse than I had hoped.
Looks like I may still graduate! The wife is thankful, but when I get home, I am guaranteed an earful!